static void Main()
{
List<Student> students = new List<Student>();
students.Add(new Student() { FirstName = "pesho", LastName = "pshev", Age = 18 });
students.Add(new Student() { FirstName = "ana", LastName = "aneva", Age = 22 });
students.Add(new Student() { FirstName = "borislav", LastName = "enchev", Age = 44 });
students.Add(new Student() { FirstName = "svetla", LastName = "ancheva", Age = 13 });
Console.WriteLine("Write a method that from a given array of students finds all students whose first name is before its last name alphabetically. Use LINQ query operators.");
var result1 = (from student in students
where student.FirstName.CompareTo(student.LastName) == -1
select student).OrderBy(s => s.FirstName).ToList();
//OrderBy e nujen za da sortirame polucheniq rezultat po azbuchen red.
//ToList() e nujen za da varne rezultata v list za da moje da se polzva po dolu ForEach
result1.ForEach(r =>
{
Console.WriteLine("{0} {1}", r.FirstName, r.LastName);
});
Console.WriteLine(Environment.NewLine + "********************************************************************************");
Console.WriteLine("Write a LINQ query that finds the first name and last name of all students with age between 18 and 24.");
var result2 = (from student in students
where student.Age >= 18 && student.Age <= 24
select new
{
FirstName = student.FirstName,
LastName = student.LastName,
}).ToList();
result2.ForEach(r =>
{
Console.WriteLine("{0} {1}", r.FirstName, r.LastName);
});
Console.WriteLine(Environment.NewLine + "********************************************************************************");
Console.WriteLine("Using the extension methods OrderBy() and ThenBy() with lambda expressions sort the students by first name and last name in descending order.");
students.OrderByDescending(s => s.FirstName).ThenByDescending(s => s.LastName).ToList().ForEach(r =>
{
Console.WriteLine("{0} {1}", r.FirstName, r.LastName);
});
Console.WriteLine(Environment.NewLine + "********************************************************************************");
Console.WriteLine("Rewrite the same with LINQ.");
var result3 = (from student in students
orderby student.FirstName descending
orderby student.LastName descending
select student).ToList();
result3.ForEach(r =>
{
Console.WriteLine("{0} {1}", r.FirstName, r.LastName);
});
}
static void Main(string[] args)
{
string name;
int point1, point2, point3, point4;
List arr = new List();
for (int i = 0; i < 3; i++)
{
Console.WriteLine("Введите имя");
name = Console.ReadLine();
Console.WriteLine("Введите 4 оценки");
point1 = Convert.ToInt32(Console.ReadLine());
point2 = Convert.ToInt32(Console.ReadLine());
point3 = Convert.ToInt32(Console.ReadLine());
point4 = Convert.ToInt32(Console.ReadLine());
arr.push(name, point1, point2, point3, point4);
}
arr.print();
arr.sort();
arr.print();
Console.ReadLine();
}
